<div class="nav-bar-root">
  <div routerLink="/products" class="product-bar" routerLinkActive="active">商品</div>
  <div routerLink="/menu" class="menu-bar" routerLinkActive="active">菜单</div>
  <div routerLink="/cart" class="cart-bar" routerLinkActive="active">购物车</div>
  <div routerLink="/my" class="my-bar" routerLinkActive="active">我的</div>
</div>
